Automation System
Direct Numerical Control means:

complete elimination of a need for a human operator.
using one computer to control several machines
None of these
eliminating computers from the manufacturing process
using several computers to control one large machine

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Automation System
Relay ladder logic is used in a PC because:

All of these
it is the best industrial control language ever developed.
None of these
it is impossible to write a control program for a machine in any other logic
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use

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Automation System
A venturi tube:

can be used to measure gas or liquid flow rates
is extremely difficult to use
is made only of metal
None of these
measures the presence of a liquid

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Automation System
The use of specialized workstations:

reduces the host computer workload and allows more users
has a high cost-performance tradeoff
None of these
provides limited growth potentials for 3-D
reduces the host computer workload

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